First, when you see public officials doing a blog post on "Microsoft.com" website instead of on a public website, you know that something fishy is going on...
On the other side, I have the feeling that this thing that clearly over-engineered. Just look at data their diagram... If I'm not wrong there is one writer and multiple reader for the data, or at least multiple writers on one side and multiple readers on another side, without a need for "real time" consistency.
So, this thing could probably have been better splitted to not have the use for "scaled" databases
On the other side, I have the feeling that this thing that clearly over-engineered. Just look at data their diagram... If I'm not wrong there is one writer and multiple reader for the data, or at least multiple writers on one side and multiple readers on another side, without a need for "real time" consistency.
So, this thing could probably have been better splitted to not have the use for "scaled" databases